Clamp for filing shaft-keys.



No. 695,686. Patented Mar. I8, I902.

B. HOLLAND.

-GLAM P FOB FILING SHAFT KEYS.

(Application filed Mary. 1, 1901.!

(No Model.)

UNITED STATES PATENT OFFICE. I

BENJAMIN HOLLAND, OF PROVIDENCE, RHODE ISLAND.

CLAMP FOR FILING SHAFT-KEYS.

SPECIFICATION forming part of Letters Patent No. 695,686, dated March 18, 1902.

Application filed March 1, 1901.

To all whom it may concern:

Be it known that I, BENJAMIN HOLLAND, a resident of Providence, in the State of Rhode Island, have invented a new and useful Improvement in Clamps for Filing Shaft-Keys or Similar Articles, of which the following is a specification.

-The object of my invention is to providea clamp for holding a shaft-key blank whereby the blank may be filed upon both sides to a definite standard size without being removed from the clamp; and it consists in a jointless clamp provided with hardened parallel jaws which are accessible for filing upon both of their sides, as hereinafter set forth.

In the accompanying drawings, Figure 1 represents the top of my improved clamp for holding shaft-key blanks or similar articles for filing. Fig. 2 represents a side view showing the clamp in one of its positions for filing the key-blank. Fig. 3 represents a side View showing the clamp in its reversed position for filing the opposite side of the blank. Fig. 4 represents a sectional view when in the position shown in Fig. 2. Fig. 5 represents a section taken in the line 5 5 of Fig. 1, showing the application of a gage-plate for the primaryinsertion of the blanksfor filing. Fig. 6 represents a perspective view of the gageplate. Fig. 7 represents a detail view showing the clamp as provided with a rectangular projection for holding in a-vise.

In the drawings, A represents a bench or block, to which the improved filing-clamp is secured by means of the bearing-stand B, which is adapted to receive the projecting pivot C of the clamp, whereby the clamp may be turned-todifierent vertical positions for reversing the filing-jaws, the said bearingstand being provided with the clampingscrew it, whereby the pivot C is frictionally held and prevented from turning while the key-blank m is being filed.

The jaws of the clampare formed of the hardened-steel plates 0. a, which are made of uniform thickness and exactly equal to that of the keys to be manufactured, the said jaws being adj ustablysecured to the integral arms I) b of the clamp by means of the tighteningscrews 0 c, the hole for the tightening-screw being made somewhat larger than the screw itself, thus allowing a little play for effecting Serial No. 49,497. (No model.)

adjustment may be effected by means of the conicallypointed ends of the adjustingscrews d d, which ends enter the conical recesses 6, formed in the jaw-plates a a,'eccentrically, as shown in Fig. 3, so that upon screwing the adjusting-screws either inward or outward the position of the jaw-plates may be changed relatively to the arms I) Z) of the clamp and then secured in their changed position by means of the tightening-screws c c.

The arm I) of the clamp is provided with a bushing f, having an internal screw-thread which fits the screw-thread g of the clampingscrew D, the said screw being provided at its outer end with the handle E, by means of which .the screw D is operated to open or close the jaws. bushing f, and upon the screw, between the bushingsf and f, is placed the tube h, which is made a little shorterthan the distance between the inner ends of the two bushings f and f, and upon the said tube h is placed the spiral spring a, which serves to spring the arms I) and b of the clamp outward, so that the jaws 'a a will be opened far enough to receive the blank 'm, from which the key is to be formed, and then by closing the jaws by means of the screw D the key-blank will be held for filing, and when the arms I) b are being screwed together Without the insertion of thc'blank the tube h will serve to limit the extent of such. movement and prevent injury to the clamp. In insertingthe key-blank into the jaws a Ct for filing I employ the gage F, which allows for'the proper insertion of the blank, so that it may project'a-few thou sandths of an inch upon both sides of the jaws, as shown in'Fig. 5, and when the blank has been filed upon one side to 'alevel with the jaws the jaws may be reversed by turning upon the pivot C'from the position shown in Fig. .2 to the position shown in Fig. 3 and the opposite side of the blank filed to a level with the opposite side of the jaws, and by this means shaft-keys may bereadily filed to exact and uniform dimensions and may be made with either parallel or tapering sides in accordance with the shape of the jaws.

As shown in Fig. 7, the clamp is provided with the projecting rectangular arm 0 in- I stead of the cylindrical pivot O of Fig. 4, and

The arm I) is provided with the in this case the clamp may be held in the jaws of a vise and be reversed therein.

I claim as my invention-- 1. A clamp having the jointless arms, and the separately-formed holding-jaws adapted for filing the opposite sides of a shaft-key blank to an exact size Without requiring the removal of the blank from the holding-jaws, the tightening-screws for fastening the jaws to the ends of the arms, the comically-pointed screws for effecting the adjustment of the jaws, and the screw for closing the jaws upon the sides of the blank, substantially as described.

2. A clamp having the jointless arms, and the separatelyformed holding-jaws adapted for filing the opposite sides of a shaft-key blank to an exact size without requiring the BENJAMIN HOLLAND.

Witnesses:

SOCRATES SCHOLFIELI), HARRY J. GARCEAU. 

